Wall or like plug



Feb. 20, 1940.

J. J/RAWLINGS 2,191,399

WALLOR LIKE PLUG Filed April 14, 1957 INVJINI'OR JOHN JOSEPH RA'XWLINGSY ATTORNEYS Patented Feb. 20, 1940 WALL R LIKE PLUG John JosephRawlings,

London, England, as

signor to The Rawlplug Company Limited,

South Kensington, London,

England Application April 14, 1937, Serial No. 136,931

In Great Britain April 20,

Claims.

This invention relates to wall or like plugs of the kind formed offibrous material made up into a tubular structure by plaiting togetheror weaving strands of the fibrous material or by holding the strands inthis formation by the aid of an adhesive or binding material, such plugsbeing intended to be inserted in holes in bricks, stone, plaster andlike materials with a view to providing a suitable lining in the holefor the reception of a nail, screw or like fastening driven into theplug previously inserted in the hole and thereby ensuring a firm holdingor retention of the said fastening therein.

The strands of fibrous material may in some cases enclose or be wrappedaround wires, or the tubular structure may be provided with a lining ofsoft metal to reinforce the plug and to facilitate entrance of thescrew.

When a plug is constructed by weaving or plaiting strands of fibrousmaterial into a tubular form, on insertion into a prepared hole it tendsto expand if tapped on the end, thus impeding its further entry into thehole, whilst if it is composed entirely of fibrous strands laid side byside, there is a tendency for it to split or open out.

The object of the present invention is to provide a plug which whilstpossessing all the known desirable features of a fibre plug, especiallya capability of expanding under the influence of a screw or nail driveninto it, nevertheless has a substantial resistance to expansion orsplittingif tapped on its end, for example, with a hammer, in order todrive it into a hole in which the plug fits closely.

According to this invention the plug is stiffened longitudinally bytheincorporation of a number of metal wires in such a manner that theyexercise practically no restraining infiuence on the expansion of theplug when a screw or nail is driven into it, but give greater rigidityto the plug.

In the accompanying drawing, Figures 1 to 4 show diagrammaticallyvarious embodiments of the invention.

For the purpose set forth, wires 3 may be.

wrapped helically around individual strands 4 of fibre and the strandsplaited together to form a wall plug, as shown in Figure 1;- or strands6 of fibre with exterior wire wrappings 5 may be laid side by side toform a tube and held in this formation by an adhesive or like bindingmaterial as shown in Figure 2. In a further arrangement according'tothis invention, as shown in Figure 3, wires 1 fibrous strandsB and ifdesired the are plaited or braided with latter may be given a twist inone direction whilst the wires have a twist in the opposite direction.

The pitch of the helical coils or plaiting of r the wires is preferablynot less than the pitch of a wood screw which the plug is intended toshown in Figure 4, where there is diagrammatically illustrated a singlestrand 9 of fibrous materialhaving wires l0 and II arranged around thestrand so as to provide relatively long strips of wire on the exteriorand interior faces of the plug.

In accordance with this invention the wires may advantageously bearranged so that a large proportion of bare metal is exposed on theouter surface of the plug, and the wires may be made some of soft metalor alloy, and some of hard metal or alloy, to ensure a maximum grip onthe wall of the hole into which the plug is inthe withdrawal. of thehole.

I claim:

the plug longitudinally from 1. A wall plug for the reception of drivenfastenings comprising fibrous material, and wires incorporated with thefibrous material, the wires being plaited with the fibrous material insuch a manner that parts of the wires are exposed on the outer surfaceof the plug.

2. A wall plug for the reception of driven fastenings, comprisingstrands of fibrous material arranged to form a tubular plug, and wireswound spirally around a plurality of the individual strands.

3. A wall plug forthe reception of driven fastenings, comprising strandsof fibrous material arranged to form a tubular plug, and metal Wires,each of said wires being in conjoint cooperative relationship with anindividual fibrous strand to form a composite fibre wire strand, partsof the wire being exposed on the exterior of the plug.

4. A wall plug for the reception of driven fastenings, comprisingstrands of fibrous material,

tionship with an individual fibrous strand, such relationship consistingin arranging the wire around the strand so as to provide relativelygreat lengths of wire on the exterior and interior faces of the strandwhen forming part of the 5 tubular structure.

JOHN JOSEPH RAWLING-S.

